Vibratory screen



J. C. SCHAFFER.

VIBRATORY SCREEN. I

APPLICATION man MAY 24, 1917.

Patented Dec. 28, 1920.

2 $HEETSSHEEI l- ATTORNEY J. C. SCHAFFER.

VIBRATORY SCREEN.

APPLICATION FILED MAY 24, 1917.

1 ,363,2'76. Patented Dec. 28, 1920.

2 SHEETS-SHEET 2.

3L C 8c Ina/7W INVENTOI? sr'k ATTORNEY OFFICE.

JOHN G. SCHAFFER, 0F TIFFIN, OHIO.

VIBRATORY SCREEN.

Specification of Letters Patent.

Patented Dec. 28, 1920.

Application filed May 24, 1917. Serial No. 170,587.

To all whom it may concern:

Be it known that 1, JOHN C. Sonarrnn,

a citizen of the United States of America, residing at Tiifin, Senecacounty, ()hio, have invented new and useful Vibratory Screens, of whichthe following is a specification.

This invention relates to vibration apparatus and material separation,especially for dry classification.

This invention has utility when incorporated in vibratory screens fortailing over the coarser particles while the finer particles passtherethrough.

Referring to the drawings:

Figure l is a side elevation, with parts broken away, of an embodimentof the invention in a horizontally disposed vibrating screen, say forcrushed stone or gravel separations Fig. 2 is an end elevation of thedevice of Fig. 3 is a plan view of one of the rockers or ipbratorysupports for the screen frame of i 1' Fig: 4 is a section on the lineVL-VI, Fig. 1, looking in the direction of the arrow- 5 is a plan viewof the screen of Fig. 1; and

Fig. 6 is an end elevation of the rocker of Fig. 3.

The driving belt 1 may rotate the pulley 2 on the shaft 3 having fasttherewith the minor eccentrics 4 having the adjusting half grooves 5engageable by the bolt 6 in anchoring each of the eccentrics of thispair to the embracing or major eccentrics 7.

, There is thus afforded a simple and effective throw adjustment for thecompound eccentrics. Embracing the major eccentrics 7 are the eccentricstraps or yokes 8 from which extend the connecting rods 9 left handthreaded thereinto, while the opposite ends of these rods 9 have righthand threaded connection with the forks 10 connected by the pivot pins11 to the rockers 12 fast with the transverse shaft 13 rockable in thebearings 14 carried by the main supporting frame 15.

This rocker 12 carries the upper bearing 16 for the transverse shaft 17which through the brackets 18 carries the rectangular frame 19. Thishorizontally disposed frame 19 may have mounted therein the perforatesheet or wire cloth 20 drawn taut therein by the bolts 21.

The throw of this screen frame 19 is entirely effective definitely atthe screen, for the rigidity of the screen holding when drawn up by thebolts 21 contributes to the positive transmission to the particlesthereon the driving throws of the apparatus. Furthermore the materialprogress over this horizontal screen is determined. Fig. 1 shows themaximum throw adjustment for the eccentrics in vibrating the screenframe.

It is to be noted that this vibration or throw 1s such that the framehas but one down or low position and one up or high position, 6., therock down being always in but one direction and then recovering, thisall occurring on one side of the high point. As shown, the stock travelon the screen will be toward the right in Figs. 1, 5. For shorter throwadjustments, the distance to the top throw position and to the bottomthrow position is reduced, but equally, leaving the mean or neutralposition constant throughout the full range of throw adjustments.Accordingly, the throw adjustment for the shorter strokes desired infiner material handling is accomplished merely by shifting the bolt 6 ineach eccentric 4 for registry with the same relative half opening 5 ofthe pair.

The rapidity of these throws is absorbed in the apparatus of thisdisclosure with a minimum of undesirable shock transmission to theframe, due to the rocker buffers acting vertically or transversely ofthe frame vibrations or reciprocations. Further, these rocker buffersare disposed in oppositely acting pairs, tending in themselves to absorbshock and assist in recovering throws.

The short arm of the rockers 12 from the bearings 16 carry the bearingpins 22 for the hanging links 23 having pivotal connections 24 with thecross heads 25 having oppositely extending guides 26 directed towardsimilar opposing tubular guides 27 in the frames 28 carryingthe rods 29through the upper helical springs 30 and the lower helical springs 31.These yieldable means may act say during compression alternately. Thelonger arms of the rockers 12 may carry the pivot pins 32, connected bythe links 33 to connections 24 on cross heads 25 below the helicalsprings 34 and above the helical compression springs 35.

In the reciprocatory travel of the frame 19, the oppositely actingsprings 30, 35, are simultaneously compressed, tending to neutralize theconcussion in themselves at an angle to the horizontal throw of thescreen;

the throws, not only contributes to the life.

of the installation with a minimum of power consumption, but is afeature in the uniform grading of output. The unldlrectionalactuatingthrow of the screen tosses the stock for progressive tumblingso that all portions thereof impact the screen.

I What is claimed and it is desired to secure by Letters Patent is;

1. A reciprocable frame, a base, rocker supports having parallel fixedfulcrum bearings in the base carrying the load of said frame, andyieldable. means coacting with said rocker supports transversely of theframe reciprocation for cushioning the downward travel of the frame.

2. A reciprocable frame, a base, a rocker support having a fixed fulcrumbearing in the base carrying the load of said frame, and yieldable meansbetween the rocker and base simultaneously coacting in two directions toneutralize transmission of reciprocation concussion from the downwardtravel of the frame.

3. A reciprocable frame, a base, a rocker support having a fixed fulcrumbearing in the base carrying the load of said frame, and neutralposition determining means coacting between the rocker and base forcushioning the downward travel of the frame.

4. reciprocable frame, a base, a rocker support having a fixed fulcrumbearing in frame supporting link pivoted to the base and frame, saidlink having an angularly extending arm, and buffer: means coacting tooppose arm travel in two directions for gushioning the downward travelof the rame.

7. A reciprocable frame, a base, a rocker frame supporting link. pivotedto the base and frame, said link having an angularly extending arm, asecond link connected to said arm, a crosshead to which said second linkextends, a slide guide for the crosshead, and helical springs on eachside of the crosshead.

8. A reciprocable frame, a base, a rocker frame supporting link pivotedto the base and frame, said link having a pair of angularly extendingarms, depending links connected to said arms, crossheads to which thelinks extend, and helical springs coacting with the crossheads toprovide buffer means for the frame for cushioning the downward travel ofthe frame. v

9. A reciprocable frame, a base, a rocker frame supporting link pivotedto the base and frame, and frame actuating means and buffer meansconnected to the link for cushioning the downward travel of the frame.

In witness whereof I aflix niyAsi nature.

JOHN 0. so F'iER.

